_=id:java.lang.Integer,lon:java.lang.Double,lat:java.lang.Double,data:java.lang.String
feature.0=0|0|0|d1
feature.1=1|-1.0|0|d2
feature.2=2|1.0|0|d3
feature.3=3|-1.0|-1.0|d4
feature.4=4|0|1.0|d5